Mr.TROLL

I agree with you, mol masses 138 and 102 C7H6O3 + C4H6O3 ---> C9H8O4 + HC2H3O2 360/138 or 2.61 mole of C7H6O3 and therefore 2.61 mol of C4H6O3 2.61 = x/102 x = 267 (I did not carry all the decimal places)

Your work would not look so confusing if you used parentheses. For example, 360 g C6H7O3 x (1 mol C6H7O3/138.118) x ..... Your work looks ok, however, I ran this on my calculator and obtained 266.08 grams. (I also used 138.123 instead of 138.118 but I don...

360g C7H6O3 x 1 mol C7H6O3/138.118 g C7H6O3 x 1 mol C4H6O3/ 1 mol C7H6O3 x 102.088 g C4H6O3/1 mol C4H6O3 = 270g C4H6O3